[PATCH v2 1/2] stmmac: intel: Add a missing clk_disable_unprepare() call in intel_eth_pci_remove()

Christophe JAILLET
2022-08-16T14:24:18Z

Commit 09f012e64e4b ("stmmac: intel: Fix clock handling on error and remove
paths") removed this clk_disable_unprepare()

This was partly revert by commit ac322f86b56c ("net: stmmac: Fix clock
handling on remove path") which removed this clk_disable_unprepare()
because:
"
While unloading the dwmac-intel driver, clk_disable_unprepare() is
being called twice in stmmac_dvr_remove() and
intel_eth_pci_remove(). This causes kernel panic on the second call.
"

However later on, commit 5ec55823438e8 ("net: stmmac: add clocks management
for gmac driver") has updated stmmac_dvr_remove() which do not call
clk_disable_unprepare() anymore.

So this call should now be called from intel_eth_pci_remove().

Fixes: 5ec55823438e8 ("net: stmmac: add clocks management for gmac driver")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
Change in v2:
* Fix a copy'n'paste typo from the error handling path of the probe to
the remove function
* Remove the big warning added below the --- in v1 (see link below if
needed)
* Add Reviewed-by:

v1:
https://lore.kernel.org/all/b5b44a0c025d0fdddd9b9d23153261363089a06a.1659204745.git.christophe.jaillet@wanadoo.fr/

Andy proposed another way to fix the issue. See the thread above.
I won't be able to propose it myself.
---
drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
index 52f9ed8db9c9..4f2b82a884b9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
@@ -1134,6 +1134,7 @@ static void intel_eth_pci_remove(struct pci_dev *pdev)

stmmac_dvr_remove(&pdev->dev);

+ clk_disable_unprepare(priv->plat->stmmac_clk);
clk_unregister_fixed_rate(priv->plat->stmmac_clk);

pcim_iounmap_regions(pdev, BIT(0));
--
2.34.1